262 COLLECTIONS FROM MELANESIA. 



joints of the chelipedes have three or four granules or spinules on 

 the posterior, but none on the anterior margin, and the palm is 

 without either granules or spinules ; the ambulatory legs are much 

 less dilated and compressed than in Mr. HaswelFs figure*. 



From Paratymolus pubescens and P. bitubcrculatus this form is 

 distinguished not merely by the different shape and tuberculation of 

 the carapace, but also by the shorter eye-peduncles and second 

 antennal joint, and by the more dilated last joint of the peduncle 

 of the antennae, and the more distinctly operculiform maxillipedes, 

 which are altogether of the Maioid type, with nearly quadrate 

 merus-joints (see fig. 6). The legs also are more robust. Colour 

 (in spirit) light yellowish brown. Length of carapace of an adult 

 female with ova nearly 3| lines (7 millim.), greatest breadth nearly 

 3 lines (6 millim.) ; length of chelipede about 3^ lines (7 millim.), of 

 second ambulatory leg about 5 lines (11 millim.). 



Three specimens (females) are in the collection from Friday Island, 

 10 fms. (No. 153). The distinctions between the two forms above 

 enumerated are, I think, too marked to be due to sex. The sex of 

 Mr. HaswelFs types from Port Denison and Port Jackson is not 

 stated, but the figure of the postabdomen nearly resembles that of 

 our adult female P. seccspinosus. 



5. Diogenes rectimaims. (Plate XXVII. fig. C.) 



The carapace is depressed, with the sides in front of the branchial 

 regions uneven and with a few hairs ; the lateral margins armed 

 with three or four spinules ; the frontal margin broadly sinuated, 

 with scarcely any trace of a median prominence, but with distinct 

 lateral spinules, situated between the bases of the eye-peduucles and 

 antenna? ; the branchial regions are but little dilated ; the rostral 

 scale is linear, acute, and reaches nearly to the apices of the oph- 

 thalmic scales, which are broadly ovate, with three or four minute 

 denticules at their distal ends. The postabdomen is clothed with 

 longish hairs, and has four filamentous appendages on its left side, 

 its fifth and sixth segments are protected by dorsal calcareous plates ; 

 the terminal segment is slightly transverse, divided by a median 

 notch into two rounded lobes, which are ciliated and spinidose on 

 the margins. The eye-peduncles are nearly as long as the transverse 

 width of the frontal margin of the carapace, much shorter than the 

 antennal peduncles, with the cornea; not dilated. The penultimate 

 joint of the peduncle of the slender antennules reaches just beyond 

 the apex of the eye-peduncles ; the antepenultimate joint of the 

 peduncle of the antennae is prolonged into a spine, which reaches 

 nearly to the apex of the following joint ; this spine is armed on its 

 inner margin with a series of smaller spinules, and there is a smaller 

 spine on its outer side at base ; the terminal peduncular joint reaches 

 beyond the eye-peduucles ; the joints of the flagella are fringed 

 below with long flexible hairs. The outer and lower margin of the 



* Ann. & Mag. Nat. Hist. ser. b, v. p. 303, pi. \\i. figs. 3-5 (1S80). 



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